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ELC Distributed I/O Adapters
MN05002003E
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www.eaton.com
83
R#
Attribute
Content
Explanation
Default
Latched
4
R/W
RTC 4
Real-time clock flag 4
OFF NO
5
R/W
RTC 5
Real-time clock flag 5
OFF NO
6
R/W
RTC 6
Real-time clock flag 6
OFF NO
7
R/W
RTC 7
Real-time clock flag 7
OFF NO
8
R/W
RTC 8
Real-time clock flag 8
OFF NO
9
R/W
RTC 9
Real-time clock flag 9
OFF NO
10
R/W
RTC 10
Real-time clock flag 10
OFF NO
11
R/W
RTC 11
Real-time clock flag 11
OFF NO
12
R/W
RTC 12
Real-time clock flag 12
OFF NO
13
R/W
RTC 13
Real-time clock flag 13
OFF NO
14
R/W
RTC 14
Real-time clock flag 14
OFF NO
15
R/W
RTC 15
Real-time clock flag 15
OFF NO
Symbol “R” refers to ready only; “R/W” refers to read and write.
R # 0 : R T C 0
When the RTC function is enabled, and the assigned trigger RTC condition is true,
ELC-CAENET will set the corresponding bit flag, R0, to ON.
R # 1 ~ # 1 5 : R T C 1 ~ 1 5
Same as R#0.
4.6
Modbus TCP Communications
The ELC-CAENET module supports the MODBUS TCP protocol. It acts as a MODBUS TCP
server, providing access to the internal data elements described earlier in this document.
4.6.1 Function Codes Supported
Function code
Explanation
Devices supported
0x02
Read discrete inputs
RX, RY, T, R, C
0x03
Read holding registers
BR, T, C, RCR
0x05
Write single coil
RY, T, R, C
0x06
Write single register
BR, T, C, RCR
0x0F
Write multiple coils
RY, T, R, C
0x10
Write multiple registers
BR, T, C, RCR
0x17
Read/write multiple registers
BR, T, C, RCR
4.6.2 Exception Codes Supported
Exception code
Explanation
0x01 Illegal
function
0x02
Illegal data address